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#include "../stdafx.h"
#include "kICMP.h"
CICMP::_mechanismus CICMP::m_mechanismus = CICMP::_icmpUndetermined;
BOOL CICMPDll::Initialize()
{
if(m_hICMP!=INVALID_HANDLE_VALUE || m_hICMPDLL)
Deinitialize();
m_hICMPDLL = ::LoadLibraryEx("ICMP",NULL,0);
if(!m_hICMPDLL)
return FALSE;
*(FARPROC*)&m_icmpCF = ::GetProcAddress(m_hICMPDLL,"IcmpCreateFile");
*(FARPROC*)&m_icmpSE = ::GetProcAddress(m_hICMPDLL,"IcmpSendEcho");
*(FARPROC*)&m_icmpCH = ::GetProcAddress(m_hICMPDLL,"IcmpCloseHandle");
if(!(m_icmpCF && m_icmpSE && m_icmpCH)){
Deinitialize(); return FALSE;
}
m_hICMP = (*m_icmpCF)();
if(m_hICMP==INVALID_HANDLE_VALUE){
Deinitialize(); return FALSE;
}
TRACE0("ICMP-DLL Initialized\n");
return TRUE;
}
void CICMPDll::Deinitialize()
{
if(m_hICMPDLL){
if(m_hICMP!=INVALID_HANDLE_VALUE && m_icmpCH)
(*m_icmpCH)(m_hICMP);
::FreeLibrary(m_hICMPDLL); m_hICMPDLL = NULL;
m_icmpCF = NULL;
m_icmpSE = NULL;
m_icmpCH = NULL;
}
m_hICMP=INVALID_HANDLE_VALUE;
if(m_sizeOut && m_bsOut){
delete m_bsOut;
m_bsOut = NULL; m_sizeOut = 0;
}
if(m_sizeIn && m_bsIn){
delete m_bsIn;
m_bsIn = NULL; m_sizeIn = 0;
}
}
LONG CICMPDll::Ping(const in_addr host,const UINT packetSize,
const UINT timeOut,LPINT pStatus)
{
if(!(m_hICMP && m_hICMPDLL && m_icmpSE)){
if(pStatus)
(*pStatus) = icmpNotInitialized;
return -1;
}
VERIFY(AdjustBuffers(packetSize));
IPINFO ipi;
memset(&ipi,0,sizeof(ipi));
ipi.Ttl = 30;
for(UINT tmp=0;tmp<packetSize;tmp++)
m_bsOut[tmp]=tmp&0xFF;
LPICMPECHO pRep = (LPICMPECHO)m_bsIn;
pRep->Status = 0xFFFFFFFFl;
if((*m_icmpSE)(m_hICMP,host.s_addr,m_bsOut,packetSize,
&ipi,pRep,m_sizeIn,timeOut))
TRACE0("ICMP-SendEcho succeeded\n");
else
TRACE0("ICMP-SendEcho failed\n");
LONG lrv = -1;
INT rv = ipUnknown;
switch(pRep->Status){
case IP_SUCCESS:
lrv = pRep->RTTime; rv = ipSuccess;
break;
case IP_BUF_TOO_SMALL: rv = ipBuffTooSmall; break;
case IP_DEST_NET_UNREACHABLE: rv = ipDestNetUnreachable; break;
case IP_DEST_HOST_UNREACHABLE: rv = ipDestHostUnreachable; break;
case IP_DEST_PROT_UNREACHABLE: rv = ipDestProtUnreachable; break;
case IP_DEST_PORT_UNREACHABLE: rv = ipDestPortUnreachable; break;
case IP_NO_RESOURCES: rv = ipNoResources; break;
case IP_BAD_OPTION: rv = ipBadOption; break;
case IP_HW_ERROR: rv = ipHWError; break;
case IP_PACKET_TOO_BIG: rv = ipPacketTooBig; break;
case IP_REQ_TIMED_OUT: rv = ipTimeOut; break;
case IP_BAD_REQ: rv = ipBadRequest; break;
case IP_BAD_ROUTE: rv = ipBadRoute; break;
case IP_TTL_EXPIRED_TRANSIT: rv = ipTTLExpiredInTransit; break;
case IP_TTL_EXPIRED_REASSEM: rv = ipTTLExpiredInReasm; break;
case IP_PARAM_PROBLEM: rv = ipParamProblem; break;
case IP_SOURCE_QUENCH: rv = ipSourceQuench; break;
case IP_OPTION_TOO_BIG: rv = ipOptionTooBig; break;
case IP_BAD_DESTINATION: rv = ipBadDest; break;
}
if(pStatus)
(*pStatus)=rv;
return lrv;
}
BOOL CICMPDll::AdjustBuffers(UINT packetSize)
{
if(!packetSize)
packetSize=1;
if(packetSize>m_sizeOut){
if(m_sizeOut && m_bsOut)
delete m_bsOut;
m_bsOut = new BYTE[m_sizeOut=packetSize];
if(!m_bsOut)
return FALSE;
}
UINT sin = sizeof(ICMPECHO)+SIZE_ICMP_HDR+packetSize;
if(sin>m_sizeIn){
if(m_sizeIn && m_bsIn)
delete m_bsIn;
m_bsIn = new BYTE[m_sizeIn=sin];
if(!m_bsIn)
return FALSE;
}
return TRUE;
}
WORD CICMPWS::m_icmpSeq = 0;
BOOL CICMPWS::Initialize()
{
if(m_socket!=INVALID_SOCKET)
Deinitialize();
m_socket = socket(AF_INET,SOCK_RAW,1/*ICMP*/);
if(m_socket==INVALID_SOCKET)
return FALSE;
TRACE0("ICMP-WS Initialized\n");
return TRUE;
}
void CICMPWS::Deinitialize()
{
if(m_socket!=INVALID_SOCKET){
closesocket(m_socket);
m_socket=INVALID_SOCKET;
}
if(m_sizeOut && m_bsOut){
delete m_bsOut;
m_bsOut = NULL; m_sizeOut = 0;
}
if(m_sizeIn && m_bsIn){
delete m_bsIn;
m_bsIn = NULL; m_sizeIn = 0;
}
}
LONG CICMPWS::Ping(const in_addr host,const UINT packetSize,
const UINT timeOut,LPINT pStatus)
{
if(m_socket==INVALID_SOCKET){
if(pStatus)
(*pStatus)=icmpNotInitialized;
}
VERIFY(AdjustBuffers(packetSize));
icmp* pPacket = (icmp*)m_bsOut;
memset(pPacket,0,m_sizeOut);
pPacket->icmp_type = ICMP_ECHO;
pPacket->icmp_seq = m_icmpSeq++;
pPacket->icmp_id = (WORD)(::GetCurrentThreadId()&0xFFFF);
for(UINT tmp=0;tmp<packetSize;tmp++)
pPacket->icmp_data[tmp]=tmp&0xFF;
pPacket->icmp_cksum = cksum(pPacket,SIZE_ICMP_HDR+packetSize);
sockaddr_in to;
memset(&to,0,sizeof(to));
to.sin_addr.s_addr = host.s_addr;
to.sin_family = AF_INET;
if(sendto(m_socket,(char*)pPacket,SIZE_ICMP_HDR+packetSize,0,
(SOCKADDR*)&to,sizeof(to)) != (int)(SIZE_ICMP_HDR+packetSize)){
TRACE1("sendto: %lu\n",WSAGetLastError());
if(pStatus)
(*pStatus)=icmpSocketError;
return -1;
}
DWORD sentTime = ::GetTickCount();
sockaddr_in from;
memset(&from,0,sizeof(from));
from.sin_family=AF_INET;
from.sin_addr.s_addr=INADDR_ANY;
fd_set fds;
FD_ZERO(&fds);
FD_SET(m_socket,&fds);
long lrv = -1;
INT rv = ipTimeOut;
for(;;){
DWORD ct = ::GetTickCount();
if((ct-sentTime)>=timeOut){
TRACE0("Timeout\n");
break;
}
timeval tv = {
(timeOut-ct+sentTime)/1000,
(timeOut-ct+sentTime)%1000
}; // tv_sec, tv_usec (secs,microsecs)
if(!select(m_socket,&fds,NULL,NULL,&tv)){
TRACE1("select: %d\n",WSAGetLastError());
break;
}
DWORD rtime = ::GetTickCount();
ASSERT(FD_ISSET(m_socket,&fds));
int fl = sizeof(from);
int rb = recvfrom(m_socket,(char*)m_bsIn,m_sizeIn,0,(SOCKADDR*)&from,&fl);
ip* pIP = (ip*)m_bsIn;
icmp* pICMP = (icmp*)&m_bsIn[sizeof(ip)];
if(pICMP->icmp_id!=pPacket->icmp_id)
continue;
if(pICMP->icmp_seq!=pPacket->icmp_seq)
continue;
if(from.sin_addr.s_addr!=host.s_addr)
continue;
if(pICMP->icmp_type==ICMP_ECHOREPLY){
lrv=rtime-sentTime;
rv=ipSuccess;
break;
}
rv = ipUnknown; // ***
break;
}
if(pStatus)
(*pStatus)=rv;
return lrv;
}
BOOL CICMPWS::AdjustBuffers(UINT packetSize)
{
if(!packetSize)
packetSize=0;
UINT osize = packetSize+SIZE_ICMP_HDR;
if(m_sizeOut<osize){
if(m_sizeOut && m_bsOut)
delete m_bsOut;
m_bsOut = new BYTE[m_sizeOut=osize];
if(!m_bsOut)
return FALSE;
}
UINT isize = osize+sizeof(ip);
if(m_sizeIn<isize){
if(m_sizeIn && m_bsIn)
delete m_bsIn;
m_bsIn = new BYTE[m_sizeIn=isize];
if(!m_bsIn)
return FALSE;
}
return TRUE;
}
WORD CICMPWS::cksum(LPVOID data,int count)
{
long lSum = 0;
WORD *pData = (WORD*)data;
while(count>0){
if(count>1){
lSum+=*(pData++);
count-=2;
}else{
lSum+=((WORD)*(BYTE*)pData)&0xFF;
count--;
}
}
lSum = (lSum&0xFFFF)+(lSum>>16);
lSum += (lSum>>16);
return (~lSum)&0xFFFF;
}
CICMP* CICMP::CreateICMP()
{
if(m_mechanismus==_icmpUndetermined)
GuessMechanismus();
switch(m_mechanismus){
case _icmpWinsock:
return new CICMPWS;
break;
case _icmpDLL:
return new CICMPDll;
break;
}
return NULL;
}
void CICMP::GuessMechanismus()
{
m_mechanismus=_icmpUndetermined;
SOCKET testSocket = socket(AF_INET,SOCK_RAW,1);
if(testSocket!=INVALID_SOCKET){
closesocket(testSocket);
m_mechanismus=_icmpWinsock;
}else{
HINSTANCE hICMP = ::LoadLibraryEx("ICMP",NULL,0);
if(!hICMP)
return;
BOOL isThere = (
::GetProcAddress(hICMP,"IcmpCreateFile")
&& ::GetProcAddress(hICMP,"IcmpSendEcho")
&& ::GetProcAddress(hICMP,"IcmpCloseHandle")
);
::FreeLibrary(hICMP);
if(isThere)
m_mechanismus=_icmpDLL;
}
}
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